Tetraaqua[3-oxo-1,3-bis(pyridinium-2-yl)propan-1-olato]nickel(II) tribromide dihydrate

The crystal structure of the title compound, [Ni(C 13 H 11 N 2 O 2 )(H 2 O) 4 ]Br 3 ·2H 2 O, contains an octahedral Ni II atom coordinated to the enol form of 1,3-dipyridylpropane-1,3-dione (dppo) and four water molecules. Both pyridyl rings on the ligand are protonated, forming pyridinium rings and creating an overall ligand charge of +1. The protonated nitrogen-containing rings are involved in hydrogen-bonding interactions with neighoring bromide anions. There are many additional hydrogen-bonding interactions involving coordinated water molecules on the Ni II atom, bromide anions and hydration water molecules.